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 Why iPhone Boot Loop after Screen Replacement?, iPhone boot loop problem solutions

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TSLinda Chan
post Jun 15 2016, 11:49 AM, updated 8y ago

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It is not unusual for an iPhone to experience problems after a recent repair, such as screen replacement. Boot loops are one of the more common symptoms of a poorly performed iPhone screen replacement. When the iPhone is powered on, the iPhone may either get stuck at the Apple logo or you might get a static blue screen; shortly after which the iPhone reboots and goes into the same cycle again. In either case, the user is unable to access the home screen.

Boot loops are often seen after screen replacement. It is important to identify what causes this problem. During the replacement of the iPhone’s screen, the four screws holding the plate over the screen connectors are replaced. These screws are not all of equal length. If you fail to note which screw goes into which hole and try to insert a long screw in a hole meant for a shorter screw, it can damage the logic board of the device. This will cause an iPhone boot loop and a blue screen. Performing a DFU restore will not resolve this issue, it will result in an error.

How can this problem be fixed?

The difficulty of resolving this problem will depend on the extent of the damage to your device’s circuit board. The first thing to try is to disassemble your iPhone, unscrew the aforementioned screws and ensure that each screw is replaced in an appropriate hole. Of the four screw holes, the lower right hole is the shortest. Make sure that a screw longer than 1.2 mm does not go into this hole. After this is done, carefully reassemble the iPhone and try turning it on. If your device’s logic board has not been rendered nonfunctional by damage, this will resolve the problem and the iPhone will start up without enter any boot loops.

If this does not resolve the issue, you will have to perform board level repairs on the iPhone. This requires a microscope as the components tend to be tiny. It wouldn’t be wise to attempt this if you are or inexperienced or lack the necessary knowledge of the iPhone’s circuit components. The lower right screw nut (the 1.2 mm one) will need to be de-soldered from the board. The top layer board material will need to be removed till you expose narrow, golden copper traces. There are seven of these fine copper traces. You will need to repair any damaged copper traces and re-solder the screw nut. Make sure that the appropriate screws go into the screen connectors and reassemble the device. This should fix the iPhone boot loop and the device should start up normally.

Some other things that can cause the boot loop include damage to the U2 chip and problems with the proximity sensor’s flex cable. If the above step did not resolve the problem, you will need to examine these components for damage and replace them if necessary.

If your iPhone experiences a boot loop or a blue screen even after trying the above steps, you will need to take the device to an Apple Store and get it replaced or repaired.

Source: http://www.hcqs.us/blog/fix-iphone-boot-lo...een-replacement

This post has been edited by Linda Chan: Jun 15 2016, 11:50 AM
foohoa
post Jun 15 2016, 11:54 AM

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b4 this those repair mid button also kena lock rite?
hightechgadgets8
post Jun 15 2016, 12:06 PM

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QUOTE(foohoa @ Jun 15 2016, 11:54 AM)
b4 this those repair mid button also kena lock rite?
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if you mean the home button; every home button (fingerprint sensor) is ID locked to the main board for security purposes. replacing the finger print sensor will not work
foohoa
post Jun 15 2016, 12:27 PM

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QUOTE(hightechgadgets8 @ Jun 15 2016, 12:06 PM)
if you mean the home button; every home button (fingerprint sensor) is ID locked to the main board for security purposes. replacing the finger print sensor will not work
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even those old iphone 5 without fingerprint sensor receive an error and cannot be boot anymore
hightechgadgets8
post Jun 15 2016, 01:54 PM

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QUOTE(foohoa @ Jun 15 2016, 12:27 PM)
even those old iphone 5 without fingerprint sensor receive an error and cannot be boot anymore
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my response was for specifically the above person. retread the first post or if you can, inspect your board for damage where the screw goes at the lcd cover
ceilouysey P
post Feb 18 2020, 06:47 PM

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For all iPhone, fix iPhone stuck on bootloop, turn to Eelphone iOS System Repair, fix iPhone without losing data, just with clicks.

 

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